A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2015 Nov 18, 23:24 -0500
A simple way, is to get a 2102D,
(Or the CP300 for more accurate results) under the assumption that you want one of the 57 stars listed in the Nautical Almanac.
Select the altitude azimuth template closest to your latitude. Rotate the altitude-azimuth template until the star is between 5 and 10° above the horizon, so the star comes out of the murk.
Convert LHA Aries to GHA Aries by adding west longitude or subtracting east longitude. Convert GHA Aries to GMT. It's easy, its graphical.
This also works for any of the other celestial objects such as Sun, moon, planets, etc; but first you must plot them on the star base.
Of course, if you want it to the second, this is not appropriate.
Is there a simple way to calculate when a star will rise or set as viewed from a specific Longitude? I know that when LHA equals your Longitude the celestial body is on your meridian but I can't seem to figure out how calculate a star's rise and set time.